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Crystals
Special Issues
Research in Shape Memory Polymer
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Special Issue "Research in Shape Memory Polymer"

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Organic Crystalline Materials".

Deadline for manuscript submissions: closed (21 October 2023) | Viewed by 2292

Special Issue Editors

Dr. Dongjie Zhang

E-Mail Website
Guest Editor
School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, China
Interests: shape memory polymer/composite materials; wetting control; adhesion control; smart gel
Dr. Qixing Xia

E-Mail Website
Guest Editor
Institute of Culture and Heritage, Northwestern Polytechnical University, Xi'an, 710000, China
Interests: metal nanomaterials; materials in protection of cultural relics
Dr. Qiang Tao

E-Mail Website
Guest Editor
College of Mechanical and Electrical Engineering, Qingdao University, Qingdao, 266071, China
Interests: mechanical design of smart deployable structures
Dr. Haiyang Zhang
E-Mail Website
Guest Editor
Department of Chemistry, College of Arts and Science, Northeast Agricultural University, Harbin 150030, China
Interests: intelligent responsive material, adhesion control

Special Issue Information

Dear Colleagues,

Shape memory polymers (SMPs) are a type of smart material that can memorize one or more temporary shapes and be recovered to their original permanent shapes under external stimuli. They are popular and extensively used in many applications, such as aerospace engineering, flexible electronics, dry adhesion, infiltration control, soft robotics, and biomedical devices. In this Special Issue, we focus on recent progress in the broad field of “shape memory materials and applications”. Submissions of in situ experimental measurements and theoretical calculations are encouraged. High-quality original research and review articles in these fields are welcome for submission to this Special Issue. The potential topics of this Special Issue include, but are not limited to, the following:

  1. Multiple shape memory polymers and applications;
  2. Two-way shape memory polymers and applications;
  3. Shape memory foam and applications;
  4. Novel shape memory composites and applications;
  5. Shape memory hydrogel and applications;
  6. 4D printing;
  7. Shape memory mechanism research.

Dr. Dongjie Zhang
Dr. Qixing Xia
Dr. Qiang Tao
Dr. Haiyang Zhang
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Crystals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • shape memory polymer
  • shape memory mechanism
  • 4D printing
  • shape memory hydrogel

Published Papers (2 papers)

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Research

14 pages, 9591 KiB  
Article
Research on the Reinforcement and Inhibition of Water–Salt Activity in Mural Ground Layers by Superhydrophobic SiO2 Particles
by
Qixing Xia
and
Wenqiang Dong
Crystals 2023, 13(10), 1522; https://doi.org/10.3390/cryst13101522 - 20 Oct 2023
Viewed by 559
Abstract
Due to notable water–salt activities, salt damage easily recurs and becomes one of the biggest challenges for the protection of ancient murals. Herein, superhydrophobic SiO2 materials with different sizes were used to modify mural ground layer substrates, and the improvement effect mechanisms [...] Read more.
Due to notable water–salt activities, salt damage easily recurs and becomes one of the biggest challenges for the protection of ancient murals. Herein, superhydrophobic SiO2 materials with different sizes were used to modify mural ground layer substrates, and the improvement effect mechanisms were systematically evaluated with scanning electron microscopy (SEM), X-ray diffraction (XRD), laser scanning confocal microscopy (LSCM), and a contact angle instrument. The results show that the superhydrophobic SiO2 can spread into the substrates though holes and cracks and further increase the contact angles of the substrates to water droplets. Compared with the initial ground layer substrate, the substrates treated with the superhydrophobic SiO2 possess stronger mechanical strength and a better ability in suppressing water–salt activity. In particular, larger-size SiO2 (mSiO2) maintains better mechanical reinforcement in the substrates, because mSiO2 can provide better support in the internal gaps of the substrates. By contrast, nSiO2 can spread deeper into the substrate than mSiO2, and more greatly improve the contact angle to water droplets, endowing nSiO2 with a better ability to restrain water–salt activity. Our study provides an alternative idea for solving salt damage in murals, and promotes the application of SiO2 materials in heritage conservation. Full article
(This article belongs to the Special Issue Research in Shape Memory Polymer)
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13 pages, 6119 KiB  
Article
Study on Electrochemical Properties of Carbon Submicron Fibers Loaded with Cobalt-Ferro Alloy and Compounds
by
Peilong Xu
,
Qinghui Yuan
,
Wendong Ji
,
Yuling Zhao
,
Ruitao Yu
,
Yimin Su
and
Ningbo Huo
Crystals 2023, 13(2), 282; https://doi.org/10.3390/cryst13020282 - 07 Feb 2023
Cited by 14 | Viewed by 1123
Abstract
In this work, carbon submicron fiber composites loaded with a cobalt-ferric alloy and cobalt-ferric binary metal compounds were prepared by electrospinning and high temperature annealing using cobalt-ferric acetone and ferric acetone as precursors and polyacrylonitrile as a carbon source. The phase transformation mechanism [...] Read more.
In this work, carbon submicron fiber composites loaded with a cobalt-ferric alloy and cobalt-ferric binary metal compounds were prepared by electrospinning and high temperature annealing using cobalt-ferric acetone and ferric acetone as precursors and polyacrylonitrile as a carbon source. The phase transformation mechanism of the carbon submicron fiber-supported Co-Fe bimetallic compound during high temperature annealing was investigated. The electrochemical properties of the carbon submicron fiber-supported Co-Fe alloy and Co-Fe oxide self-supported electrode materials were investigated. The results show that at 138 °C, the heterogeneous submicron fibers of cobalt acetylacetonate and acetylacetone iron began to decompose and at 200 °C, CoFe2O4 was generated in the fiber. As the annealing temperature increases further, some metal compounds in the carbon fiber are reduced to CoFe2O4 alloy, and two phases of CoFe2O4 and CoFe-Fe-alloy exist in the fiber. After 200 cycles, the specific capacity of CF-P500 is 500 mAh g−1. The specific capacity of the composite carbon submicron fiber electrode material can be significantly improved by the introduction of CoFe2O4. When the binary metal oxides are used as electrode materials for lithium-ion batteries, alloy dealloying and conversion reactions can occur at the same time in the reverse process of lithium intercalation, the two reactions form a synergistic effect, and the cobalt-iron alloy in the material increases the electrical conductivity. Therefore, the carbon submicron fiber loaded with CoFe2O4/CoFe has an excellent electrochemical performance. Full article
(This article belongs to the Special Issue Research in Shape Memory Polymer)
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